PeteMatul wrote:O.k. one vote for dual mono and one vote for stereo. Anyone else want to weigh in?
It *depends* on the content. If you listen to it, does it sound like everything's coming from dead centre between the two speakers? Do the meters move absolutely in unison? If so then it's likely to be dual mono.
But almost all dialogue is likely to be mono - music and sfx more likely to be stereo.
You can also use metering to tell - really need a decent metering plug-in I think -
https://www.toneboosters.com/index.html#anchor_download (uncheck everything but Goniometer when installing) - will show up in effects | metering | TB Goniometer - will show a straight vertical line if it's mono content.

- Yellow needle is STEREO - PPMulator
- Yellow is STEREO.gif (353.71 KiB) Viewed 550 times
Here's what PPMulator can show - but that's a paid for plug-in - this is showing loudness as the bar graph and PPM needles - Red & Green for Left & Right and then White & Yellow for Mid & Side (mono & stereo parts of signal). If it's mono then the yellow needle will not move. If yellow needle is higher than white then it's out of phase.